Thank you Michael for the great info.

- I plan on visiting many parts of the country, including mountains, deserts, and other wild-animal friendly parts. I just thought I would feel better,doing this by myself, if I had some extra protection.

- I think I will do a combination of camping by the car and hiking to remote sites, so I will pack somewhat heavy for those luxurious nights by the car.

- You are right - 30F is being sort of idealistic. I am just a wimp for the cold - I guess I will just try to stay as south as possible, unless I here some warm fronts are coming in north.

Again - Thanks!